Simplify case-insensitivity checks on Mac OS X

* src/fileio.c (file_name_case_insensitive_p): Try skipping the
Darwin code and instead using pathconf with _PC_CASE_SENSITIVE.
Leave in two alternatives conditionally compiled based on
DARWIN_OS_CASE_SENSITIVE_FIXME in case pathconf doesn't work.

* etc/PROBLEMS: Mention the possible problem with pathconf on
Mac OS X.

1 files changed, 12 insertions, 0 deletions

diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index 62d2bd1d26d..bbf865cf3f8 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -2415,6 +2415,18 @@ If this does not work, please inform bug-gnu-emacs@gnu.org.  Then
 please call support for your X-server and see if you can get a fix.
 If you do, please send it to bug-gnu-emacs@gnu.org so we can list it here.
 
+
+* Runtime problems specific to Mac OS X
+
+** On Mac OS X, file-name-case-insensitive-p may be unreliable
+
+The implementation of that function on Mac OS X uses pathconf with the
+_PC_CASE_SENSITIVE flag.  There have been reports that this use of
+pathconf does not work reliably.  If you have a problem, please
+recompile Emacs with -DDARWIN_OS_CASE_SENSITIVE_FIXME=1 or
+-DDARWIN_OS_CASE_SENSITIVE_FIXME=2, and file a bug report saying
+whether this fixed your problem.
+
 * Build-time problems
 
 ** Configuration